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<credit type="author copyright">
 <name>Petr Kovar</name>
 <email>pknbe@volny.cz</email>
 <years>2014</years>
 </credit>

<desc>MIME types are used to identify the format of a file.</desc>
 </info>

<title>What are MIME types?</title>
 
 In GNOME, MIME (Multipurpose Internet Mail Extension)
 types are used to identify the format of a file. The GNOME Desktop
 uses MIME types to:
 
 <list>
 <item>
 
 Determine which application should open a specific file format by
 default.
 
 </item>
 <item>
 
 Register other applications that can also open a specific file format.
 
 </item>
 <item>
 
 Provide a string describing the type of a file, for example,
 in a file properties dialog of the <app>Files</app>
 application.
 
 </item>
 <item>
 
 Provide an icon representing a specific file format, for
 example, in a file properties dialog of the <app>Files</app>
 application.
 
 </item>
 </list>
 
 MIME type names follow a given format:
 
<screen>
<var>media-type</var>/<var>subtype-identifier</var>
</screen>

 <sys>image/jpeg</sys> is an example of a MIME type where
 <sys>image</sys> is the media type, and <sys>jpeg</sys>
 is the subtype identifier.

 
 GNOME follows the freedesktop.org Shared MIME Info
 specification to determine:
 
 <list>
 <item>
 
 The machine-wide and user-specific location to store all MIME type
 specification files.
 
 </item>
 <item>
 
 How to register a MIME type so that the desktop environment knows which
 applications can be used to open a specific file format.
 
 </item>
 <item>
 
 How the user can change which applications should open what file formats.
 
 </item>
 </list>
 <section id="mime-database">
 <title>What is the MIME database?</title>
 
 The MIME database is a collection of all MIME type specification files
 that GNOME uses to store information about known MIME types.
 
 
 The most important part of the MIME database from the system administrator’s
 point of view is the <file>/usr/share/mime/packages/</file>
 directory where the MIME type related files specifying information on
 known MIME types are stored. One example of such a file is
 <file>/usr/share/mime/packages/freedesktop.org.xml</file>, specifying
 information about the standard MIME types available on the system by
 default. That file is provided by the <sys>shared-mime-info</sys>
 package.
 
 </section>
 <section id="mime-types-more-information">
 <title>Get more information</title>
 
 For detailed information describing the MIME type system, see the
 freedesktop.org Shared MIME Info specification located at the
 freedesktop.org website:
 
 <list>
 <item>
 
 <link href="http://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec/">
 http://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec/</link>
 
 </item>
 </list>
 </section>
</page>